Answer: C (Educated Guess, read about wind below)
Step-by-step explanation:
It’s a guess, more so a presumption. A solar sail would require what a sail on earth does to make its main part move..... wind flow. Yet wind flow, aka convection, is caused by the sun warming air on different parts of the earth, increasing its pressure, pushing away cold air, creating wind. There isn’t any surface in space that the heat can build upon... not knowing anything about the other choices, this about choice C is enough to convince me that it is the one that is not effective.